package com.zzyl.framework.interceptor;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;
import com.zzyl.common.utils.UserThreadLocal;
import com.zzyl.framework.web.service.TokenService;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 微信小程序端的拦截器
 */
@Component
public class MemberInterceptor implements HandlerInterceptor {
    @Autowired
    private TokenService tokenService;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 如果不是Controller层的请求，(静态资源)直接放行
        if (!(handler instanceof HandlerMethod)){
            return true;
        }

        // 1.获取header中的token
        String token = request.getHeader("authorization");
        // 2.判断token是否存在，如果不存在，响应401
        if(ObjectUtil.isEmpty(token)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        // 3.如果存在，解析token
        Claims claims = null;
        try {
            claims = tokenService.parseToken(token);
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        // 4.判断token是否正确，如果不正确，响应401
        if (ObjectUtil.isEmpty(claims)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        // 5.如果解析成功，获取token中的数据
//        Long userId = Long.valueOf(String.valueOf(claims.get("userId")));
        Long userId = MapUtil.getLong(claims,"userId");
        // 6.判断数据是否为空，如果为空，响应401
        if (ObjectUtil.isEmpty(userId)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }

        // 7.如果数据不为空，将数据存入ThreadLocal
        UserThreadLocal.set(userId);

        // 8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 1.删除ThreadLocal中的数据
        UserThreadLocal.remove();
    }
}
